Research peptides you can actually verify.
PepBiotics publishes the HPLC purity and mass-spec identity for every single lot — net peptide content, endotoxin, the whole panel. Enter the lot number from your vial and read the data before you order.
First order?WELCOME10saves 10%STACK15for 15% off $75+
4.6/5
2,000+ verified reviews
186
batch COAs published
ISO 17025
independent accredited lab
- Independent labISO/IEC 17025-accredited
- HPLC + mass specverified every lot
- Public COAsbatch-matched & verifiable
- US cold-chainships in 1–2 business days
- 30-day guaranteereship on any issue
- Independent ISO/IEC 17025 lab
- HPLC purity ≥98%
- Mass-spec verified identity
- ICP-MS heavy-metal screen
- Batch-level COAs published
- Net peptide content disclosed
- Endotoxin tested (LAL)
- Verify your COA by Report ID
- Lot lookup from your vial
- Cold-pack shipping
- Research use only
Good to know
Every lot, decoded — from synthesis to your COA
No slogans, no “trust us.” Here is the exact path every PepBiotics vial takes before its lot number ever reaches your label.
- 01
Synthesized in the USA
Solid-phase synthesis, then lyophilized to a stable powder. Each production run becomes a single traceable lot.
- 02
Purity by RP-HPLC
Reverse-phase HPLC quantifies purity and resolves impurities — the headline percentage on every certificate.
- 03
Identity by mass spec
ESI mass spectrometry confirms the molecular weight matches the target sequence. No guessing what's in the vial.
- 04
COA published to the lot
Every result is signed by Aegis Bioanalytical Laboratories and published to the vault — searchable by the lot number on your label.
Categories
Organized by research area
Radical transparency
Don’t trust us. Verify us.
“Third-party tested” is the peptide industry’s favorite unverifiable claim. We make it verifiable: every lot is tested by Aegis Bioanalytical Laboratories, an independent ISO/IEC 17025-accredited lab, and its full Certificate of Analysis — stamped with a unique Report ID you can check — is published before it goes on sale.
Purity typically runs 98–99%+ and moves lot to lot. We publish the real number for each batch — not a flat 99.9% that no honest HPLC run produces.
- 1
Tested by an independent lab
Aegis Bioanalytical Laboratories runs HPLC purity, mass-spec identity, an ICP-MS heavy-metal screen, net content and endotoxin — accredited, with no shared ownership with us.
- 2
Published with a Report ID
The certificate goes into our public library — purity, identity, net content, pass/fail — each stamped with a unique, checkable Report ID.
- 3
You verify what's in your hand
The lot number on your vial pulls the exact COA, and the Report ID must match. Anyone can check it — no account needed.
- Products
- 0
- Products
- COAs published
- 0
- COAs published
- Average rating
- 0.0
- Average rating
Try a live lot:
Every vial prints its lot number on the label. Enter it to read the exact third-party report for your batch — HPLC purity, mass-spec identity, net content, endotoxin.
The standard
What “done properly” means here
HPLC + mass spec
Independent analytical labs verify purity and identity for every lot.
COAs published
Every certificate in a public library, searchable by product or lot.
Net content disclosed
Net peptide content, water, and counterion reported — so your concentrations are real.
Cold-chain shipping
Lyophilized vials shipped with a cold pack; reshipped free if a lot arrives damaged.
Side by side
Us vs. the typical gray-market vendor
The difference isn't the molecule — it's whether you can verify the vial in your hand.
| What you get |  PepBiotics | Typical gray-market vendor |
|---|---|---|
| Independent, ISO/IEC 17025-accredited testing | ||
| HPLC purity + mass-spec identity per lot | ||
| ICP-MS heavy-metal + endotoxin screen | ||
| Batch-level COA published before sale | ||
| Unique COA Report ID you can verify | ||
| Lot lookup from the vial in your hand | ||
| Net peptide content disclosed | ||
| Cold-chain packaging | ||
| Vials with no paperwork at all |
Reviews
Verified researchers, verified lots
2340+ published reviews from the labs that re-test what we ship — moderated only for spam.
From the bench
Researchers, not influencers
No paid endorsements — just the people who qualify reference material for a living, on why they reorder.
Verified buyerMarcus R.
Independent researcher
The lot number on my vial matched the COA exactly. First supplier where I could actually verify what I received.
Elena K.
Research scientist
HPLC traces published for every batch. This is what “third-party tested” was always supposed to mean.
Mei L.
Lab lead
Discreet packaging, cold-chain intact, and the certificate was in the box. Reordered within the week.
Dr. Thomas H.
University researcher
I qualify a lot of reference material. The analytical transparency here is genuinely rare.
David O.
Lab technician
Reconstitution guide and bacteriostatic water in the same order — saved me a second purchase.
Verified buyerSofia M.
Biotech grad student
Fast shipping and the purity spec held up when I ran it myself. Exactly as labelled.
“I qualify incoming reference materials for a shared research facility, which means I re-test what vendors send. PepBiotech's COAs consistently match my own HPLC and mass-spec reads. That reproducibility is the entire point of a research supplier, and most don't clear the bar.”
Dr. Sarah OkaforAnalytical chemist · academic core facility“For complex analogs like the incretin peptides, the fatty-acid side chain is where cheap material fails. Their mass-spec data accounts for it against the theoretical mass…”
David Chen, PhDPrincipal investigator · metabolic signaling“Traceability is non-negotiable for us — every material has to map to a lot and a certificate. The lot-number lookup and per-batch COA library make our QA audits painless.…”
Dr. Amelia RostovaLab manager · contract researchLearn
Data first, marketing never
Guides for working with research peptides — reading a COA, reconstitution, purity, and storage.
FAQ
Fair questions, straight answers
More questions? Read the full FAQ or talk to us.
Verify before you buy
Every lot’s Certificate of Analysis is published before it goes on sale — HPLC purity, mass-spec identity, net content. Read the data first, then order. Damaged shipments are reshipped free.